Physics
Which of the following terms is not used in the field of physics?

Nuclear fusion
Stock value
Refractive index
Latent heat

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Physics
It is easier for a man to swim in sea water, than in river water because

The sea is-deeper than the river
The sea is wider than the river
The density of sea water is lesser than the density of river water
The density of sea water is more than the density of river water

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Physics
The velocity of sound in air

Increases with decrease of temperature
Decreases with decrease of temperature
Does not depend on temperature
Decreases with increase of temperature

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